The word
originated as a slur for people with disabilities. That is its origin and still the first definition in the dictionary (for slang usage). You're trying to argue that a word is not defined the way the dictionary defines it.
Dictionaries aren't perfect, but they're more widely agreed-on and useful than your anecdata.
> they're trying to apply US (at least parts of the US) cultural norms to international projects
Out of 379M native English speakers[1], 234M[2] live in the US. That's about 61%. If our English-language norms are widespread, they're also likely used by a majority of native English speakers.
(That's also not including Canada, which shares many of our language norms.)
> alienating most of the world
How does changing the name of Gimp "alienate" anyone? Whose feelings would be hurt and why? Who would stop using the product out of rage?
1. https://www.ethnologue.com/statistics/size
2. https://factfinder.census.gov/faces/tableservices/jsf/pages/...